Chinese researchers claim they may have discovered a new mutated sub-type of the novel coronavirus which has a prolonged ability to infect others.
Experts found an unusual case of a middle-aged man with COVID-19 disease who was infectious for 49 days - a record length of time never reported before.
However, the man's symptoms were mild and the researchers said he appeared to have formed a 'dynamic balance' with the virus.
The 'chronic' case indicates a strain which can spread among people for weeks, even if the host doesn't show many symptoms.
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